This plan for this paper, and the realization that a proof of this nature should be possible, was envisioned
over a decade ago, motivated by the then-recent work [1]} but also by conversations
between the second author and Felix Schulze during a sequence of quarter-long visits by Schulze to Stanford.
Those conversations were perhaps precursors to [2]}, but certainly also to the present paper. The details
have been slow in coming, not for any particularly good reason,
but in any event, gradually crystalized during a number of visits of varying lengths to Stanford by the first, third and
fourth authors in the intervening years, and later, as the project came together, in other visits by the second author
to Rome and Pisa.
